Draw pot



Sept. 18, 1928. 1,684,456

J. A. REECE DRAW POT Filed May 18, 1925 I N VE N T U 1 1 dosc-ph H. Peece.

, ATTORNEY.

Patented Sept. 18, 1928.

UNITED STATES PATENT OFFICE.

JOSEPH A. REECE, OF TOLEDO, OHIO, ASSIGNOR TO THE LIBBEY-OWENS SHEET GLASS COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

DRAW POT.

Application filed May 18, 1925. Serial No. 30.937.

The present invention relates to sheet glass apparatus, and has particular reference to an improved form of sheet edge forming means.

An important object of the invention is to provide an apparatus for producing sheetglass including a draw-pot which is provided with preferably slotted means at its sides which engage the border portions of the sheet being drawn to create edges on the sheet for the purposes of maintaining the sheet to Width.

Another object of the invention is to provide a sheet glass draw-pot having inwardly extending spaced projections between which the edges of the sheet being drawn are adapted to pass, the said projections offering resistance to the glass entering the border portions of the sheet, whereby this glass will be more viscous than the main body of the sheet.

Still another object of the invention is to provide a draw-pot for use in sheet glass apparatus having inwardly extending projections carried by the sides of the pot. the said projections forming slotted means for contacting with the border portions of the sheet, the said slots offering less resistance in their centers than at their ends.

Other objects and advantages of the invention will become apparent during the course of the following description.

In the drawings wherein like numerals are employed to designate like parts throughout the same,

Fig. l is a transverse vertical section through a portion of a draw-pot showing my improved construction.

Fig. 2 is a perspective view of the drawpot,

Fig. 3 is a vertical transverse section of the width maintaining means, and

Fig. 4 is a top plan view thereof.

As is well-known in the art, sheet glass, in accordance with the Colburn Patent 1,248,809, granted Dec. 4, 1917, can be produced by continuously drawing a sheet from a mass of molten glass contained in a drawpot.

Edge engaging rotatable knurled rolls are provided to create so-called knurled edges on the sheet of a nature to prevent narrowing of the sheet as it is being drawn. These klllll'led edges are later removed and the sheet cut to the desired dimensions.

It is an aim of the present invention to replace the knurled rolls with stationary means preferably carried by the drawpot, thus obviating the requirements of many mechanically movable parts and cooling medium conduits.

As is shown in the drawings, in Fig. 1, the numeral 5 designates a draw-pot containing a mass of molten glass 6 from which a sheet 7 is drawn. In accordance with the Colburn process a bending roll 8 is provided to deflect the sheet from a vertical plane to a horizontal plane, whereby it may be run oven a flattening table and through an annealing leer.

The sides 9 and 10 of the pot are provided with the inwardly extending projections 11 and 12 respectively, which are spaced to form a slot 13 through which the border portions 14 of the sheet 7 may pass. The projections 11 and 12 in reality create a slotted width maintaining device which may or may not be formed integral with the side walls of the pot. If it is desired the width maintaining means may be formed separately and slipped into a slot 15 as indicated in Fig. 2. In those instances where the projections 11 and 12 are formed integral with the pot it will be formed from a refractory clay, but if it is desired this refractory clay may be covered with a shell of non-corrosive metal such as nichrome. monel, stellite, etc. The projections 11 and 12 are adapted to be partia ly submerged in the mass of molten glass as clearly shown in Fig. 3 with their inner adjacent faces being preferably curved downwardly and outwardly as at lti so that the lower portion 19 of slot 13 will be substantially wider than the upper portion thereof, thus producing a relatively large area adapted to contact with the glass and to offer sufficient resistance to the glass passing into the portions 14 of the sheet to 'irevent narrowing of the sheet after it has formed. 7

As is clearly shown in Fig. 4, the slot 153 is relatively wider between its ends as at 17 so that the slot will otter greater resistance at its ends thin in the center to the glass being formed. liy restricting the velocity of the glass at the edges as by drawing through a slot, the glass may be considered as being crowded at these restricted areas, and thus the tendency of the glass is to avoid this resistance by moving toward the center and away from the edges. By creating the bulged portion the edges will be locked or keyed within the slot until they pass therethrough, after which they will have enough body to overcome the tendency of the sheet to narrow.

In addition to the slotted members carried by the pot an air pipe or pipes 18 may be used to blow a jet of air on the edges of the sheet to further assist in forming a relatively tough edge thereon. If the edge thus formed is thought to be too stiff to be deflected over the bending roll 8, a burner may be applied to resoften the glass as is ordinarily done in the Colburn process.

Claims:

1. In sheet glass apparatus, a tank furnace containing a mass of molten glass, a draw-pot in open communication therewith, means for drawing a sheet from the glass in the pot, and slotted means carried by the sides of the pot, the slot therein being elongated in top plan and bulged at its center.

2. In sheet glass apparatus, a tank furnace containing a mass of molten glass, a draw-pot in open communication therewith, means for drawing a sheet from the glass in the pot, and slotted means carried by the sides of the pot through which the edges of the sheet being drawn pass, the slot being elongated in top plan and curved to offer less resistance to the glass intermediate its ends.

3. In sheet glass apparatus, a tank furnace containing a mass of molten glass, a draw pot in open communication therewith, means for drawing a sheet from the glass in the pot, and means formed integrally with the sides of said pot and extending inwardly thereof for forming a slot through which the border portions of said sheet pass, said slot being elongated in top plan and relatively wider at its center than at its ends.

4. A draw pot of the character described, including pairs of inwardly extending projections formed integrally therewith, the adjacent faces of each pair of projections being curved downwardly and outwardly.

5. A draw pot of the character described, including side portions and a pair of inwardly extending projections formed integrally with each of said side portions, each pair of projections being associated to form a slot therebetween, elongated in top plan and relatively wider at its center than at its ends.

6. In an apparatus for producing sheet glass, wherein a glass sheet is drawn upwardly from a mass of molten glass, a pot containing the mass of molten glass, and slotted members arranged at opposite sides of the pot through which the border portions of the sheet are drawn, said slotted members being partially submerged in the mass of molten glass and the slots thereof being wider at their lower ends than at their upper ends.

7. In an apparatus for producing sheet glass, wherein a glass sheet is drawn upwardly from a mass of molten glass, a pot containing the mass of molten glass, and slotted members arranged at opposite sides of the pot through which the border portions of the sheet are drawn, said slotted members being partially submerged in the mass of molten glass and the adjacent sides of the slots thereof curving downwardly and outwardly to create a relatively large area of glass contacting surface.

8. In an apparatus for producing sheet glass, wherein a glass sheet is drawn up wardly from a mass of molten glass, a pot containing the mass of molten glass, means formed integrally with the opposite sides of the said pot and extending inwardly thereof to form slots through which the border portions of said sheet pass, said means being partially submerged in the mass of molten glass and the width of said slots being greater at their lower ends than at their upper ends.

9. In an apparatus for producing sheet glass, wherein a glass sheet is drawn upwardly from a mass of molten glass, a pot containing the mass of molten glass, and means formed integrally with the opposite sides of the said pot and extending inwardly thereof to form slots through which the border portions of said sheet pass, said means being partially submerged in the mass of molten glass and the adjacent sides of said slots curving downwardly and outwardly to provide a relatively large area of glass contacting surface.

10. In an apparatus for producing sheet glass, wherein a glass sheet is drawn upwardly from a mass of molten glass, a pot containing the mass of molten glass, and a pair of inwardly extending projections formed integrally with each side of the pot for engaging both sides of the sheet at its edges, the adjacent faces of said projections curving downwardly and outwardly to provide a relatively large area of glass contacting surface.

11. In an apparatus for producing sheet glass, wherein a glass sheet is drawn upwardly from a mass of molten glass, a pot containing the mass of molten glass, and a pair of inwardly extending projections formed integrally with each side of the pot, each pair of projections forming a slot therebetween through which the adjacent sheet edge is drawn, said slot being elongated in top plan and relatively wider at its center than at its ends.

12. In an apparatus for producing sheet glass, wherein a glass sheet is drawn up wardly from a mass of molten glass, a pot containing the mass of molten glass, and a pair of inwardly extending projections formed integrally With each side of the pot, each pair of projections forming a slot therebetween through Which the adjacent sheet edge is drawn, said slot being elongated in top plan and bulged at its center, the adjacent sides of said slot curving downwardly and outwardly so that the said slot is Wider at its lower end than at its upper 10 end.

JosEPH A. REEGE. 

